Joumal of Sound and Vibration 465(2020)115017 Contents lists available at ScienceDirect Journal of Sound and Vibration ELSEVIER journal homepage:.elsevier./locate/jsvi A step excitation optimization method for intensive modal identification of cable net structures Xintao Wang Hua Deng Space Structures Research Center College of Civil Engineering and Architecture Zhejiang University.Hangzhou 310058.China ARTICLE INFO ABSTRACT Article history: Compared with the direct force measurement of cables dynamic modal testing is more Received 16 April 2019 economic and applicable in engineering for monitoring the stiffness change of cable net Received in revised form 6 September 2019 structures caused by pretension deviation.Normally it is sufficient to detect the variation Accepted 11 October 2019 of structural key stiffness by testing a few modes (target modes)that are however likely Available online 15 October 2019 Handling Editor:L.Trendafilova located in the region of dense modes.To effectively evaluate the stiffness of an existing cable net structure the identification accuracy of these target modes should be improved Keywords: when using conventional time-domain methods e.g. the eigensystem realization algo- Cable net structure rithm (ERA).Structural free vibration can be induced by a step excitation that is generated Step excitation optimization by simultaneously releasing loads hung on the cable net.In this paper the modal energy in Modal identification the structural fre...
Hindawi Publishing Corporation Abstract and Applied Analysis Volume 2014 Article ID 513530 8 pages dx.doi.org/10.1155/2014/513530 Hindawi Research Article Feedforward and Feedback Vibration Control and Algorithm Design for Cable-Bridge Structure Nonlinear Systems Yan-Jun Liang Shi-Liang Wu 2 De-Xin Gao and Xiao-Rong Xue' School of Computer and Information Engineering Anyang Normal University Anyang 455000 China 2 School of Mathematics and Statistics Anyang Normal University Anyang 455000 China 3 College of Automation and Electronic Engineering Qingdao University of Science and Technology Qingdao 266042 China Correspondence should be addressed to Yan-Jun Liang:myluck0404@126. Received 9 December 2013;Revised 15 February 2014;Accepted 20 February 2014;Published 23 March 2014 Academic Editor:Ryan Loxton Copyright 2014 Yan-Jun Liang et al.This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Technique of feedforward and feedback optimal vibration control and simulation for long-span cable-bridge coupled systems is developed.Buffeting loading systems of long-span cable-bridge structure are constructed by weighted amplitude wave superposition method.Nonlinear model of cable-bridge coupled vibration control system is established and the corresponding system of state space form is described.In order to reduce buffeting ...
Engineering Structures 207 (2020)110187 Contents lists available at ScienceDirect ENGINEERING STRUCTURES Engineering Structures ELSEVIER journal homepage:.elsevier./locate/engstruct Self-centering cable brace with friction devices for enhancing seismic performance of RC frame structures Chack for Tong Guo" Jishuai Wang Yongsheng Song Weihong Xuan Yuzhi Chen Key Laboratory of Cancrete and Prestressed Concrete Structures of the Ministry of Education Southeast University Nanjing 210096 PR China ARTICLE INFO ABSTRACT Keywords: A novel self-centering cable brace (SCCB)with friction devices is developed to improve the seismic performance Self-centering of existing RC frame structures.This paper presents the structural configuration and the theoretical load-dis- Cable brace placement relationship of the SCCB.Cyclic loading tests are conducted to show the effectiveness of the SCCB Friction and a numerical model is established and validated based on the test results.A parametric analysis is made to Seismic performance investigate the influence of tendon stiffness and friction on hysteretic performance of the SCCB.Nonlinear dy- Strengthening namic analyses are further carried out on a nine-story RC frame which is seismically deficient and enhanced with buckling restrained braces (BRBs)and SCCBs respectively for parison.Inter-story and residual inter- story drifts base shear forces load-axial elongation relationships and self-centering indexes of the bare and strengthened fram...
Iranian Journal of Science and Technology Transactions of Civil Engineering (2020)44:115-126 https:/doiorg/10.1007/s40996-020-00345-5 RESEARCH PAPER Check fou updates Cable Tension Estimation for Suspen-Dome Structures Based on Numerical Method Zhiguang Yang'.Bing Liang'.Haiging Liu'.Zhongwei Zhao D Received:20 August 2017/Accepted:4 January 2020/Published online:13 January 2020 Shiraz University 2020 Abstract Suspen-dome structures have been widely adopted due to their superiority over traditional structures.Cable condition is crucial to the safety of suspen-dome structures especially the magnitude of cable force.However thus far investigations on estimating the tension in this type of structure remain lacking.In this study double-element method was initially devel- oped to simulate cables and its accuracy was validated.Tension pensation method was adopted to ensure that the cable force is equal to the designed value.Then transient analysis was conducted based on an actual suspen-dome structure.The dynamic responses derived based on the overall structures and the simplified models were pared and the reliability of the simplified models was validated.Finally parametrical analysis was conducted to investigate the influence of support stiffness and cable-bending stiffness on the fundamental frequency of cables.A cable tension estimation program which was suitable for suspen-dome structures was updated.Results indicate that vibration method can maintain good accuracy when ...
Ceramics International 46(2020)6469-6476 Contents lists available at ScienceDirect CERAMICS INTERNATIONAL Ceramics International ELSEVIER journal homepage:.elsevier./locate/ceramint Extrusion-based 3D direct ink writing of NiZn-ferrite structures with viscoelastic ceramic suspension Taekyu An Kwang-Taek Hwang Jin-Ho Kim Jihoon Kima aDivision of Advanced Materials Engineering.Kangju National University Cheonan Chungchungnam-do 32588 South Korea Icheon Branch Korea Institante of Ceramic Engincering Technology (KICET) Icheon-si Gyeonggi-do 17303 South Korea ARTICLE INFO ABSTRACT Keywords Advances in additive manufacturing (AM) represented as the instant evolution of design files into fully func- Direct ink writing tional products provide customer-centric smart manufacturing solutions that are increasingly replacing tradi- Auger-extrusion tional manufacturing methods in various industries.However the advantages of AM often diminish when ap- NiZn-Ferrite plied to the production of ceramic ponents owing to the demanding nature of ceramic materials.Extrusion- Magnetic core based direct ink writing (DIW)is considered one of the few AM technologies applicable to ceramic materials. Ceramic 3D printing Precise control of the ceramic suspension is required in extrusion-based 3D DIW to create 3D structures for various industrial products.This study describes a fundamental relationship between the rheological properties of the ceramic suspensions and their 3D DIW printability.The...
Current Applied Physics 14(2014)1455-1459 Contents lists available at ScienceDirect Current Applied Physics Current Applied Physics ELSEVIER journal homepage:.elsevier./locate/cap Gate-tunable valley-filter based on suspended graphene with double CrossMark magnetic barrier structures Nojoon Myoung a b.1 Gukhyung Ihm b." a Institute of Quantum Systems Chungnam National University Daejeon 305-764 Republic of Korea bDepartment of Physics.Chungnam National University.Daejeon 305-764 Republic of Korea ARTICLEINFO ABSTRACT Article history: We theoretically investigate the effects of strain-induced pseudomagnetic fields on the transmission Received 16 June 2014 probability and the ballistic conductance for Dirac fermion transport in suspended graphene.We show Received in revised form that resonant tunneling through double magnetic barriers can be tuned by strain in the suspended re- 18July2014 Accepted 12 August 2014 gion.The valley-resolved transmission peaks are apparently distinguishable owing to the sharpness of Available online 1 September 2014 the resonant tunneling.With the specific strain the resonant tunneling is pletely suppressed for Dirac fermions occupying the one valley but the resonant tunneling exists for the other valley.The Keywords: valley-filtering effect is expected to be measurable by strain engineering.The proposed system can be Graphene used to fabricate a graphene valley filter with the large valley polarization almost 100%. Valley filter o 2014 Els...
Applied Mathematics Letters 103 (2020)106185 Contents lists available at ScienceDirect Applied Mathematics Lf Applied Mathematics Letters ELSEVIER .elsevier./locate/aml Exponential decay rate for the energy of a flexible structure with dynamic delayed boundary conditions and a local interior damping Boumediene Chentoufa " Sabeur Mansourib Kuwait University Faculty of Science Department of Mathematics Safat 13060 Kuwait UR Analysis and Control of PDEs UR19ES64 Department of Mathematics Faculty of Sciences of Monastir University of Monastir 5019 Monastir Tunisia ARTICLE INFO ABSTRACT Article history: This note is dedicated to study the energy decay of a flexible structure with a local Received 6 November 2019 interior damping.The system consists of a platform and a flexible cable holding Received in revised form 9 December a load mass.Taking into account the dynamics of both ends of the cable and the 2019 presence of a delay term in the boundary we manage to show that the presence Accepted 9 December 2019 of a localized distributed damping is strong enough to obtain the exponentially Available online 16 December 2019 decay of the energy of the system.This improves the result obtained in Ammari Keywords: and Chentouf (2020)where the damping was distributed over the entire spatial Flexible structure domain. Dynamic delayed boundary conditions O2019 Elsevier Ltd.All rights reserved. Local interior damping Exponential energy decay 1.Introduction and preliminary results The pr...
Structures23(2020)139-151 Contents lists available at ScienceDirect Structures Structures ELSEVIER journal homepage:.elsevier./locate/structures On the static properties and stability of 800 m long-span mega-latticed suspension structures Check for Qingwen Zhanga b" Zibin Zhaoa b Jianfeng Chena b Feng Fan b Shizhao Shena b a Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education Hartbin Instituate of Technology Harbin 150090 China Key Lab of Smart Prevention and Mirigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Hartin institute of Technology Harbin 150090 China ARTICLE INFO ABSTRACT Keywordk In order to develop super long-span structures the characteristics of suspension bridges are considered for use in Super long-span suspended hybrid structures initially considering a structure with a span of 800 m.The control parameters for Suspended hybrid structure the geometrical shape of the structure are given and a structural model is established using ANSYS.The initial Static analysis form of the main cable is studied and a feasible pylon scheme is designed.Static stability and parameter analysis Stability of the structure are conducted and progressive collapse analysis after the breakage of the sling is undertaken. Parameter analysis Progressive collapse analysis The results show that both wind loads and temperature have significant effects on the structure.There is not a destabilization problem exist ...
目 次 总则 2 术语 （2） 3基本规定 (4) 4空调通风系统 (6) 4.1一般规定 ..... 4.2空调通风系统节能调适 (6) 4.3空调通风系统运行维护 (8) 5电气系统 (10) 5.1一般规定 (10) 5.2电气系统节能调适 (10) 5.3电气系统运行维护 (11) 6给水排水系统 (13) 6.1一般规定 (13) 6.2给水排水系统节能调适 (13) 6.3给水排水系统运行维护 (14) 7监测与控制系统 (16) 7.1一般规定 (16) 7.2 监测与控制系统节能调适 (16) 7.3监测与控制系统运行维护 (17) 8调适验收 ...... (19) 本规程用词说明 (21) 引用标准名录. (22) 附：条文说明. (23)
Contents General provisions (1) 2 Terms (2) 3 Basic requirements （4) 4Air conditioning and ventilation system (6) 4.1 General requirements ... （6) 4.2E Energy-saving missioning of air conditioning and ventilation system........ （6） 4. 3 Operation and maintance of air conditioning and ventilation systerm...... (8) 5 Electrical system.. (10) 5.1 General requirements .... (10) 5.2Energy-saving missioning of electrical system ..... (10) 5.3 Operation and maintance of electrical system . .(11) 6Water supply and drainage system (13) 6.1 General requirements ..... 6. 2 Energy-saving missioning of water supply and drainage system 6. 3 Operation and maintance of water supply and drainage ......sds 7Monitoring and control system (16) 7. 1 General requirements ..* (16) 7. 2 Energy-saving missioning of monitoring and control system .... （16) 7. 3 Operation and maintance of monitoring and control system ..... （17) 7.
8Acceptance for missioning Explanation of wording in this specification (21) List of quoted standards (22) Addition:Explanation of provisions (23)
1总则 1.0.1为加强地铁车站的节能运行，提高能源利用效率，降低 地铁车站的运行能耗，制定本规程。
